472 



THE BACTERIOPHAGE AND ITS BEHAVIOR 



Case Ler , whose chart is not given, also gave a negative blood culture. 



Here, again, the blood contained a bacteriophage at the time when the patient's 

 temperature began to fall. The fall in temperature was gradual, and continuous, 

 and convalescence occurred without incident. 



Chart 19. Case Tr Clinically, Typhoid Fever 



The blood|culture was negative; the bacieriophige was present 



Chart 20. Case Ri Clinically, Typhoid Fever 



The blood culture was negative; the bacteriophage was present 



We may summarize the findings on this group of cases by saying that very often 

 the blood cultures in typhoid fever are negative at the time when defervescence 

 begins; and that when a bacteriophage is found in the blood stream of these cases 



